【codeigniter】codeigniter3でsqlite3を使うよ!

application/config/database.php

<?php
$active_group = 'sqlite';
$query_builder = TRUE;

$db['sqlite'] = array(
    'dsn'  => 'sqlite:'.APPPATH.'sqlite/db.sqlite',
    'hostname' => '',
    'username' => '',
    'password' => '',
    'database' => '',
    'dbdriver' => 'pdo',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'autoinit' => TRUE,
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);
?>

で動いた。

<?php
'dsn'  => 'sqlite:'.APPPATH.'sqlite/db.sqlite',
?>

の

<?php
'dsn'  => 'sqlite:'
?>

に気づくまでめっちゃ長かった！